Jag är van vid att ta bussen till jobbet, även när det regnar.

Är van vid means am used to / am accustomed to.

It matches English be used to:

• Jag är van vid att ta bussen = I am used to taking the bus

It does not mean the past-habit meaning of English used to do:

• I used to take the bus = Jag brukade ta bussen

So this Swedish sentence describes a current state: the speaker is accustomed to it now.

Because van vid is a common Swedish pattern meaning accustomed to.

You can think of vid as the preposition that goes with van in this meaning:

• van vid kylan = used to the cold
• van vid det = used to that
• van vid att ta bussen = used to taking the bus

English uses to in used to, but Swedish uses vid here. Prepositions often do not match directly between languages.

After van vid, Swedish normally uses att + infinitive when the next idea is a verb:

• van vid att ta bussen
• literally: used to to take the bus

That looks strange from an English point of view, because English says:

• used to taking the bus

So this is a grammar difference:

• English: be used to + -ing
• Swedish: vara van vid + att + infinitive

Yes, you may hear both:

• Jag är van att ta bussen
• Jag är van vid att ta bussen

Both are used and both can mean I’m used to taking the bus.

The version with vid makes the accustomed to idea especially clear, and it fits very naturally with the structure in your sentence.

Ta bussen is a very natural way to say take the bus.

Another common option is:

• åka buss = go by bus / travel by bus

So:

• Jag tar bussen till jobbet = I take the bus to work
• Jag åker buss till jobbet = I go to work by bus

The first one often focuses a bit more on the chosen means of transport. The second focuses more on the mode of travel.

Because Swedish often uses the definite form in these everyday transport expressions:

• ta bussen
• ta tåget
• ta bilen

This does not always mean one specific previously mentioned bus. It often just means the usual / the relevant means of transport.

If you said ta en buss, it would sound more like:

• take a bus
• take one bus
• take some bus, not necessarily the usual one

Because Swedish normally says till jobbet or till arbetet for to work.

This is one of those places where English and Swedish package the idea differently:

• English: to work
• Swedish: till jobbet / till arbetet

Also compare:

• på jobbet = at work
• från jobbet = from work

So jobbet is definite because that is the natural Swedish expression.

Here även means even:

• även när det regnar = even when it rains

It adds a sense of contrast:

• the speaker takes the bus to work despite rain too

You could compare:

• även när det regnar = even when it rains
• också när det regnar = also when it rains

Även is the better choice here if you want the strong even meaning.

Because när means when (or whenever) and fits a repeated, real situation:

• även när det regnar = even when it rains / whenever it rains

Om means if and sounds more conditional:

• även om det regnar = even if it rains

Both can be possible in different contexts, but here när fits the idea of a normal recurring situation.

It is a dummy subject, just like English it in:

• It is raining

So:

• det regnar = it is raining

In Swedish, weather expressions often use det:

• det snöar = it is snowing
• det blåser = it is windy / it is blowing

Not really. In modern Swedish, that comma is often optional.

You can write:

• Jag är van vid att ta bussen till jobbet även när det regnar.

The comma in your sentence mainly adds a small pause or helps readability:

• Jag är van vid att ta bussen till jobbet, även när det regnar.

So it is not wrong, but it is not required either.